振動インテンシティに関する考察

概要

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Vibration intensity (VI) is defined as vibrating energy flow, and it is expected to be useful in the exploration of a vibrating source, and measurements of dissipated energy. There have been many studies on VI, but those which perform a quantitative analysis of VI is scarce. It remains to be clarified whether the cause of VI error is the measurement method or the basic theory of VI. In this paper, VI of a lumped mass system is defined and VI for four lumped mass systems (two proportional and two non proportional damping systems) is calculated. From calculation results of instantaneous VI, active VI, and dissipated energy, it is shown that the definition has provided the characterirtics of VI suiffciently. Next, VI in the case of damping force is not treated as internal force is calculated for each of the vibration systems. As a result, when damping force is not considered, calculation results of VI are erroneous. In particular, in the case of a non proportional damping system, an error is found not only in the quantity of energy flow but also in the direction of VI. Therefore, it is difficult to estimate dissipated energy by VI.
一般社団法人日本機械学会の論文
1997-07-25